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The Chamberlain Group, a small firm in Great Barrington in the southern Berkshires, has carved out a niche making hearts, blood vessels, bowels, and various other body parts for medical training.

The company, started in 1999 by Eric and Lisa Chamberlain, does several million dollars worth of business each year serving two primary markets: hospitals and medical device makers who need to demonstrate their products and train doctors to use them.